i missed my period am i pregnant

i was on the pill for a long time and then in feb i decided to get off we wanted to have another child we have a little boy now so i have been having my periods the 25th of every month from feb to may since i got of the pill and now i havent had a period since july and i took 2 pregnancy test and the both came out negative and i didnt take a test since could i be pregnant can anyone help me or email me i really need help with this paulettakeeping22@hotmail.com
thank you

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